Micrometer-gage.



L. MASTRANGEL.

MIGBOMETEB GAGE. APPLIUATIQN FILED un 26, 190s.

' E v B'y A TTOHNE YS l abus renna. be, ima. ummm. nA L I LOUIS MASTRANGEL, OF NEW YORK, N. Y.

MICROME TER-GAGE y Specification of Letters Patent.

Patented March 9, 1909.

Application filed May 26, 1908. Serial No. 435,031.

Toall 'whom it may concern:

Beit known that I, Louis MASTRANGEL, .a subject of the King of Italy, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented anew and Improved full, clear, and exact description.

'l'his invention relates to certain improvements in micrometer gages, and the main object of the im-'entionis to provide means whereby the distance between a stationary base or a known surface and a given point, may be accurately determined.

1 contemplate in my invention the pro-l vision of a standard serving as a support for a latorally-extending arm, and at the eind of the arm I provide an indicating mechanism whereby the dist-ance between 'the end of a movable member at the end of the arm and the base or support for the standard, may be read on a sultable dial carried by the arm.

A further object ol my invention is to provide an indicator for indicating the movement of a longitudinally-movable member, the connecting mechanism between the pointer of the indicating means and said member being so mounted that there will no back lash or lost motion.

Referencel'is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate correspondingr parts in all the iiglures, and in which- Figure 1 is a side elevation of an instrument constructed in accordance with my invention; Fig. 2 is a detail showing the cover of a portion of the arm removed and the support for the longitudinally-inovable member in section; and Fig. 3 is a transverse section on the line '3-3 of Fig. 1.

In the specific form of my improved microm'eter gage illustrated, I employ a base 10,

serving to support a 'standard 11, andextending outwardly laterally from the standard is an arm 12. The arm carries a member 13 movable toward and from the base 10, and also carries an indicating means whereby the extent ofthe movement of said member may be determined. The base may be of any suitable character, but is .preferably provided With a slot extending lengthwise thereof, as illustrated in dotted lines. The standard 11 carries a collar 14 which engages with the up )er surface of the base, land the lower end Ao the standard extends through the l 1s provided with a Micrometer-Gage, of which the following 1s a rod.13,

slot and is threaded to receivea lock nut 15, shown in dotted lines. The standard may be shifted along the slot in the base, and may be rigidly secured in position by the tightening of the lock nut. The standard plurality of apertures 16, arranged in two parallel lines, and each having a bushing ,17 constituting a lining for the opening. One end of the arm 12 is in the form of a sleeve 1S, encircling the standard 11 and provided with a lining or bushing 19 to form an accurate and close t with the standard. At one side of the sleeve there are a plurality of apertures 20, each provided with its bushing 21, and these apertures are preferably arranged in two parallel lines corresponding with the two parallel rows of apertures in t-he standard. A suitable pin 22 is provided for insertion through registering apertures of the sleeve and standard,

and a suitable set screw 23 is threaded through the sleeve for engagement with the side of the aperture to lock the parts in position.

The arm at its outer end forms a sleeve 24,' extending at substantially right angles to the general direction of the arm and substantially parallel tol the standard 11. The sleeve 1s provided with bushingsor linings 25 adjacent the opposite ends thereof, and serves to support the longitudinally-movable member 13. This member is preferably in the form of a rod or bar and moves in a line at right angles to the plane o1' the upper surface of the base10. At the upper end of the rod, it is provided. with a linurled or rough'ened collar 26, which serves as a Uri ping portion to facilitate the raising ofz5 t 1e and also serves for engagement with a shoulder on the sleeve 24 to limit the downward movement. In conjunction with the rod, I employ a spring 27, so mounted as to neutralize to a artial extent the action of gravity on the roi and permit the rod to rest lightly against t-he object being measured, irrespective of the welght of the rod. As shown, this spring has one end thereof secured to a pin 28 carried by the rod, and the other end secured to. a' portion of the arm.

It is evident that any suitable spring may be by suitable end plates 31 and 32, each having one side thereof curved to correspond to the curvature, of the dial. A pointer 33 is mounted on an arbor 34 mounted in the back of the chamber 29 and in a bracket 35 secured to said back, A portion of the rod 13 is provided with teeth to form a rack bar, and within the chamber 29 is a train of gears for transmitting motion from the rack bar to the arbor 34 and the pointer 33 carried thereby. Any suitable number of gear wheels 36 may be employed to make u this train, the number of gears and their re ative sizes being dependent upon the length of movement of the rod or bar required to swing the pointer 3 3 through one revolution. If the instrument is designed for measuring in inches and fractions thereof7 I would use such a train of gears that a longitudinal movement of the rod 13 through one-half of an inch would cause the pointer to swing through five com lete revolutions, and by subdividing the ial 30 into one hundred equal parts, measurements of onethousandth of aninchmay be made with accuracy. By subdividing the dial in a different manner and `employing a diiierent train of gears, greater or less delicacy may be secured as desired. Within the cavity or chamber 29, I mount a gear wheel 37 in engagement with a gear wheel on the arbor 34, and in connectionl with said gear wheel I employ a coil spring 38 normally tending to rotate all of t e gears and the pointer in onedirection. The strength of the spring is such that it does Ilot roduee any movement of the rod or bar 43 but merely serves to take up back lash or lost motion. The distance between the a ertures in the standard 11 bears a direct re ationship .to the length of movement of the rod 13 and the resulting movement of the pointer. 'lhe arm 12 may be secured to the standard with the end of the roil 13 any desired number of half-inches from the base 10. In using the device, the objectto be measured may be laced on the base and the arm 12 raised or iuwered to such a position that the lower end of the rod 13 will be at the nearest half-inch below the total height of the object. The dial 30 is rotated to bring the zero directly beneath the pointer and the rod is raised and the object inserted therebeneath. The rod is then permitted to descend until it engages lightly with the uppermost portion of the object, and the extent to which the pointer has been rotated ma be read on the dial. This taken in addition to the particular point on the standard to which the arm is secured, will give the total height of the object. rotatable so that the zero may be brought beneath the pointer when the latter is in any position about the circumference, so that I may often avoid the necessity for adding or subtracting when determinlng small differences in heivht between different objects. The dial iits friction tight, so that it will remain stationary unless positively rotated.

Having thus described my invention', I claim as new and desire to secure by Letters Patent:

In a micrometer gage, a stationary base serving to support the gage and also serving to support the object to be measured, a standard extending upwardly from said base and carried thereby, an arm extending outwardly from said standard and movable longitudinally of the standard, a vertically-disposed rod carried by said arm adjacent its outer end and movable toward and from said base, said arm having a cavity or chamber therein intermediate the rod and the standard, a rack bar carried by said rod, a pointer, a train of gears within said cavity er chamber for transmitting motion from said rod to said pointer, and a normally stationary dial adjacent said pointer and covering said cavity or chamber, to conceal said gears, said dial being rotatable to bring any portion thereof opposite said pointer.

In testimony whereof l have signed my name to this specification in the presence of two subscribing witnesses. I

LOUIS MASTRANGEL.

l/Vitnesses:

W. V. IIOUCK, A. A. llinnn.

The dial is f 

